Humor (n.) is easily enough definable as a weapon of criticism and subversion, but it is very often a mere comfort or survival technique.
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Humor (n.) is made up of the easier forms (caricature and mimicry) and the potentially revolutionary and mordant forms (the ironic and the obscene).
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Humor (n.) is about pushing boundaries. If you worry that you might be going too far, you have already not gone far enough. If everybody laughs, you have failed.
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Humor (n.) is part of the armor-plate with which to resist what is already farcical enough.
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Humor (n.) arises from the ineluctable fact that we are all born into a losing struggle.